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Functional yeast protein improves fish health in reduced fishmeal diets

Published on: 11/24/2020
Author/s : Otavio Castro, MS – Global Aquaculture Manager at Phileo by Lesaffre

Functional yeast proteins supplementation in reduced fishmeal diets for orange-spotted grouper (Epinephelus coioides) reduces gut inflammation, improves villi structure and increase survival after Vibrio harveyi disease challenge.Fishmeal reduced diets for aquaculture have been successfully validated in the past years for different species such as shrimp, salmon, trout, etc. Formulating balanced f...

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Paul Roberts Paul Roberts
November 24, 2020
If you want to "prove" a feed formulation; run it for a full life cycle. Another way to test is a "feed all they will eat" until they "break" meaning that a minor formulation failure get multiplied until the fish get sick.
Otavio Serino Castro Otavio Serino Castro
Global Species Manager - Aquaculture
Phileo by Lesaffre Phileo by Lesaffre
Marcq-en-Baroeul cedex, Nord-Pas-de-Calais, France
November 26, 2020
Dear Paul, thank you for your comment. This specific trial targeted young stage animals, and to demonstrate scientifically the effects of the yeast functional protein in the gut health, when formulating with increased plant proteins. I do agree that running a full cycle trial would amplify the negative impacts from gut inflammation and reduced digestibility of amino acids. In our approach, the lab scientific validation is the starting point to a later validation under farm/specific conditions with our customers and partners. Feed formulation and aquaculture environment are two very dynamic things exposed to complex multifactorial interactions, and that’s why we work on developing solutions to mitigate the impact of suboptimal and extreme conditions in the animals.
Paul Roberts Paul Roberts
November 27, 2020

Otavio Serino Castro Thank you. I appreciate it when an author makes a thoughtful reply to my posts.

Jeff Laliberte Jeff Laliberte
December 26, 2020
All I know is protein doesn't need to be derived from a fish species source, but i worry about the absence of fatty proteins.I think the answer is earthworms. We make our own fish food here at Chasco Fish Co. in port Richey , Florida.
Akintomide Yinka Akintomide Yinka
PhD in Veterinary (Fish) Medicine
February 15, 2021
Yes, I believe that there are lots of viable substitutes - blue algae, (various) fly larvae, earthworms, cockroaches..., , all depending on the formulator's skill, the fish in question (nutrient requirement) and the culture environ (water quality / available nutrient). The main issues are ensuring that it's economical, sustainable and healthy.
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Louis Landesman
Louis Landesman
  Petersburg, Virginia, United States
Alternative protein sources with added-value functional propertie...